Call Statistics Screen

 

You can access the Call Statistics screen on the phone to display counters, statistics, and voice-quality metrics in the following ways:

  • During call: You can view the call information by rapidly pressing the ? button twice. 
  • After the call: You can view the call information captured during the last call by displaying the Call Statistics screen.


Note You can also remotely view the call statistics information by using a web browser to access the Streaming Statistics web page. This web page contains additional RTCP statistics not available on the phone. For more information about remote monitoring, see Remote Monitoring.

 

A single call can have multiple voice streams, but data is captured for only the last voice stream. A voice stream is a packet stream between two endpoints. If one endpoint is put on hold, the voice stream stops even though the call is still connected. When the call resumes, a new voice packet stream begins, and the new call data overwrites the former call data.

 

Display Call Statistics Screen

To display the Call Statistics screen for information about the last voice stream, follow these steps:

 

Procedure

Step 1 Press Settings.

Step 2 Select Status.

Step 3 Select Call Statistics.

 

Call Statistics Fields

The following table describes the items displayed on the Call Statistics screen:


Item

Description


Rcvr Codec 


Type of voice stream received (RTP streaming audio from codec): G.729, G.728/iLBC, G.711 u-law, G.711 A-law, or Lin16k.


Sender Codec

 
Type of voice stream transmitted (RTP streaming audio from codec): G.729, G.728/iLBC, G.711 u-law, G.711 A-law, or Lin16k.
 


Rcvr Size


Size of voice packets, in milliseconds, in the receiving voice stream (RTP streaming audio).


 Sender Size

 
Size of voice packets, in milliseconds, in the transmitting voice stream.


Rcvr Packets

 
Number of RTP voice packets received since voice stream was opened.

 

Note

This number is not necessarily identical to the number of RTP voice packets received since the call began because the call might have been placed on hold.

 
Sender Packets


Number of RTP voice packets transmitted since voice stream was opened.

 

Note

This number is not necessarily identical to the number of RTP voice packets transmitted since the call began because the call might have been placed on hold.

 
Avg Jitter


Estimated average RTP packet jitter (the dynamic delay that a packet encounters when going through the network) observed since the receiving voice stream was opened.
                      


Max Jitter

 

Maximum jitter observed since the receiving voice stream was opened


Rcvr Discarded


Number of RTP packets in the receiving voice stream that have been discarded.

 

Note

The phone discards payload type 19 comfort noise packets that are generated by Cisco Gateways, which increment this counter.

 


Rcvr Lost Packets


Missing RTP packets (lost in transit).


Voice Quality Metrics


MOS LQK


Score that is an objective estimate of the mean opinion score (MOS) for listening quality (LQK) that rates from 5 (excellent) to 1 (bad). This score is based on audible concealment events due to frame loss in the preceding 8-second interval of the voice stream. For more information, see 
Voice Quality Monitoring


Note 

The MOS LQK score can vary based on the type of codec that the Cisco Unified IP Phone uses.

 


Avg MOS LQK


Average MOS LQK score observed for the entire voice stream.


Min MOS LQK


Lowest MOS LQK score observed from start of the voice stream.


Max MOS LQK


Baseline or highest MOS LQK score observed from start of the voice stream. These codecs provide the following maximum MOS LQK score under normal conditions with no frame loss:

  • G.711 gives 4.5
  • G.722 gives 4.5
  • G.728/iLBC gives 3.9
  • G.729 A/AB gives 3.8 



MOS LQK Version

 
Version of the Cisco proprietary algorithm used to calculate MOS LQK scores.


Cumulative Conceal Ratio


Total number of concealment frames divided by total number of speech frames received from start of the voice stream.


Interval Conceal Ratio


Ratio of concealment frames to speech frames in preceding 3-second interval of active speech. If using voice activity detection (VAD), a longer interval might be required to accumulate 3 seconds of active speech.
                   


Max Conceal Ratio


Highest interval concealment ratio from start of the voice stream. 
           


Conceal Secs


Number of seconds that have concealment events (lost frames) from the start of the voice stream. This includes severely concealed seconds.


Severely Conceal Secs


Number of seconds that have more than 5 percent concealment events (lost frames) from the start of the voice stream.


Latency (see note)


Estimate of the network latency, expressed in milliseconds. Represents a running average of the round-trip delay, measured when RTCP receiver report blocks are received.


Network Protocol

                  
Identifies the current Network Protocol.


 

Note When the RTP Control Protocol is disabled, no data generates for this field and thus displays as 0.